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тАО03-08-2006 08:21 PM
тАО03-08-2006 08:21 PM
Business copy and open files
Can i place a sanpshot into a different diskgroup? I have heard tha this is only possible with snapclones? Is it true?
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тАО03-08-2006 10:51 PM
тАО03-08-2006 10:51 PM
Re: Business copy and open files
The BC does not know about the file system or file status. To ensure data integrity, you must freeze the access to your data. If your backup software handles open files and can be integrated with BC, it should be able to warranty the data integrity.
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тАО03-09-2006 01:08 AM
тАО03-09-2006 01:08 AM
Re: Business copy and open files
Peace.
In-array snapshot/clone solutions like BC works independently of the "filesystem" on top. So to ensure your "snapshots/clones" are fine and dandy - your process should include ensuring that your filesystem and processes using it (i.e. Oracle DB) are in a state that ensures no files are open or being changed.
However, since it is not a guarantee that you won't have open files at the time of the snapsot/clone/split -- the filesystem software has intelligence to take care of the inconsistencies -- that is why, on remount of the filesystems on your snapshot/clone sets -- you or the process behind are always mandated to do a filesystems check - which should be fast since we always use a journalling filesystems these days -- aka. VxFS.
Cheers.
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тАО03-09-2006 06:22 PM
тАО03-09-2006 06:22 PM
Re: Business copy and open files
I presume BC EVA here.
Business copy EVA doesn't directly interact with file or filesystem. The BCV generation is done at storage level where storage data blocks (storage sets) comes into the picture.
BC EVA make a consisitent copy of those storage blocks. In order to make consistent copy, it freezes a volume , make a copy and release (thaw) it. Hence BC EVA does have dependancy, interaction and support with volume managers e.g. LVM on HPUX , VXVM on Solaris. So whatever the state of a open file data at the time of freeze, it would be retained in BCV.
With latest version of BC EVA and XCS software , snapshots could be also be placed in a different disk group like snapclones.
Refer the link
http://h18006.www1.hp.com/products/storage/software/bizcopyeva/index.html
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Take some time to assign points to the replies against your queries to make it equal. Assign points based on how responses helped to answer your queries/doubts. Moreover, if you assign points, in future you would get early and more responses against your questions too.
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тАО03-10-2006 09:19 AM
тАО03-10-2006 09:19 AM
Re: Business copy and open files
As from quickspec:
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EVA allows for increased flexibility and improved capacity utilization by supporting changing the Vraid type with Cross Vraid Snapshot and Snapclone, within the same disk group and Cross Vraid Snapclone across disk groups. Cross Vraid Snapclone also supports changing the Vraid type when Snapcloning from a high performance disk group to a FATA disk group.
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Also from AdminGuide:
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A snapshot is created in the same disk group as the source virtual disk.
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Luis, new add-on to BC, T4390A Replication Solutions Manager EVA Application Integration LTU allows you to suspend Oracle database prior to snapshot. Also you can flush cache and suspend MS SQL server prior to snapshot with HP DButil (automatically with BC jobs).
http://h20000.www2.hp.com/bizsupport/TechSupport/SoftwareDescription.jsp?lang=en&cc=us&prodTypeId=18964&prodSeriesId=315919&prodNameId=1833639&swEnvOID=1005&swLang=8&mode=2&taskId=135&swItem=co-30988-1